Sideboard



FIG. 1 is a front perspective view of a sideboard showing the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a left elevation view thereof;

FIG. 5 is a right elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is another front perspective view thereof showing the drawings in various open positions;

FIG. 9 is another front elevation view thereof showing the left door moved to a middle position; and,

FIG. 10 is another front elevation view thereof showing the doors moved to a middle position.

The broken lines shown in the figures illustrate portions of the sideboard that form no part of the claimed design. 

CLAIM The ornamental design for a sideboard, as shown and described. 